Marcy Yonker, MD is a board-certified pediatric neurologist and director of the Headache Program at Barrow Neurological Institute at Phoenix Children's Hospital. Dr. Yonker obtained her MD from the University of Pittsburgh, School of Medicine and was a resident at both Children's Hospital of Philadelphia and University of Pennsylvania.

She worked as a neurologist in Philadelphia and as a director of the pediatric headache program at the DuPont Hospital for Children in Wilmington, Delaware before arriving at Phoenix Children's Hospital.